Find Least Common Multiple of 84, 98 and 126 using prime factorisation method.
Answer
LCM( 84, 98, 126 ) = 1764
Explanation
Step 1: Write down factorisation of each number:
84 = 2 · 2 · 3 · 7
98 = 2 · 7 · 7
126 = 2 · 3 · 3 · 7
Step 2 : Match primes vertically:
| 84 | = | 2 | · | 2 | · | 3 | · | 7 | ||||
| 98 | = | 2 | · | 7 | · | 7 | ||||||
| 126 | = | 2 | · | 3 | · | 3 | · | 7 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 84 | = | 2 | · | 2 | · | 3 | · | 7 | ||||||
| 98 | = | 2 | · | 7 | · | 7 | ||||||||
| 126 | = | 2 | · | 3 | · | 3 | · | 7 | ||||||
| LCM | = | 2 | · | 2 | · | 3 | · | 3 | · | 7 | · | 7 | = | 1764 |
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.
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